.plugin {
    width: 100%;
    height: 480px;
    background-image: url(../img/backgroundimage.jpg);
}
.operation{
    width: 1170px;
    margin: 0 auto;
    margin-top: 30px;
    margin-bottom: 30px;
}
.operation .operation-img{
    width: 1170px;
    height: 120px;
    background-image: url(../中间图片/大牌特卖.jpg);
}
.operation img{
    width: 378px;
    height: 250px;
    display: block;
    float: left;
    margin: 0 12px 18px 0;
}